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Poison gas was used throughout the First World War by almost all armies. Its widespread use was unique in the history of warfare. The various types of gas, delivered by canisters, projectors, or shell, killed, maimed, and wore down morale. By 1918, soldiers of all armies encountered gas frequently while serving at the Western Front. Canadian soldiers were among the first to face the death clouds, at the Second Battle of Ypres in April 1915. At least 11,572 Canadian soldiers were casualties of poison gas, yet many were denied pensions after the war. During the Second World War, chemical weapons were not used on the battlefield; however, the Suffield Experimental Station in Alberta developed and tested chemical and biological weapons beginning in 1941. From about the middle of the 20th century, Canadian officials worked on the global stage to ban chemical weapons, and in the 1990s, Canada signed the Chemical Weapons Convention (see Arms Control and Disarmament.)

The Sound Surveillance System (SOSUS) was a network of passive sonar stations established by the United States Navy (USN) in the early 1950s to “listen” for Soviet submarines. SOSUS was a core element of antisubmarine warfare (ASW) during the Cold War. It developed out of intense postwar oceanographic research into how sound is propagated under water. Given Canada’s shared responsibility for the defence of North America, the Royal Canadian Navy (RCN) was actively engaged in this research and mission and helped operate SOSUS. The mission was highly classified throughout the Cold War and only declassified in 1991. SOSUS became part of the Integrated Undersea Surveillance System (IUSS), a broader network of fixed and towed sensors that remains operational.

The Battle of the Scheldt was fought in northern Belgium and southwestern Netherlands in 1944 during the Second World War. It was part of the Allied campaign to liberate northwestern Europe and defeat Nazi Germany. The First Canadian Army played a crucial role in clearing the Scheldt of German forces, opening crucial supply lines via the port of Antwerp. However, this victory came at a cost. The Allies suffered nearly 13,000 casualties during the battle, including more than 6,300 Canadians.

The Dutch Hunger Winter was a severe food crisis that took place in the Netherlands in 1944–45, during the Second World War. By the time the country was liberated by Canadian and Allied forces in May 1945, around 20,000 Dutch people had died from the famine. With liberation came an influx of food and other provisions for the starving population. The Canadian role in liberating the Netherlands resulted in a lasting relationship between the two countries.

Canada helped develop the world’s first nuclear reactors and nuclear arms. During the Second World War, Canada participated in British research to create an atomic weapon. In 1943, the British nuclear weapons program merged with its American equivalent, the Manhattan Project. Canada’s main contribution was the Montreal Laboratory, which later became the Chalk River Laboratory. (See Nuclear Research Establishments). This Allied war effort produced the atomic bombs dropped on the Japanese cities of Hiroshima and Nagasaki in 1945. It also led to the development of Canada’s nuclear energy industry. Click here for definitions of key terms used in this article.

The Responsibility to Protect (R2P) is a non-binding political commitment made by United Nations Member States to protect populations from genocide, crimes against humanity, ethnic cleansing and war crimes. Canadian leadership was instrumental in the establishment of the International Commission on Intervention and State Sovereignty (ICISS) in 2000, which led to the development and eventual adoption of R2P at the 2005 UN World Summit (see also Canada and Peacekeeping).

This article was originally published in Maclean’s magazine on September 12, 2005. Partner content is not updated. FOR THE FIRST TIME SINCE the attacks of Sept. 11, 2001, Canadian and American officials will sit down across the table from one another this month and begin delicate negotiations over the future of their joint military institutions.

Canada has a long, complicated history with weapons of mass destruction (WMDs). Canadian soldiers have been attacked with chemical weapons and have used them offensively. (See Canada and Gas Warfare.) Canada has researched chemical, biological and nuclear weapons; but also, ways to defend against them. Some chemical weapons were tested in Canada and against Canadians with long-term consequences. Canada played a crucial role in the development of nuclear weapons. (See Canada and the Manhattan Project.) The country employed nuclear weapons primarily as defensive weapons during the Cold War. Canada signed international documents limiting the use of these weapons. Canada no longer has weapons of mass destruction. However, Canada is a member of the North Atlantic Treaty Organization and NORAD — alliances that employ nuclear weapons and other weapons of mass destruction.

This article was originally published in Maclean’s magazine on September 23, 2002. Partner content is not updated. IT WAS BY MOST ACCOUNTS an uncomfortable meeting when Jean CHRÉTIEN sat down with George W. Bush for 45 minutes in Detroit's Cobo Hall last week.

For much of its history, the Canadian military had a policy of punishing or purging LGBTQ members among their ranks. During the Cold War, the military increased its efforts to identify and remove suspected LGBTQ servicemen and women due to expressed concerns about blackmail and national security. In 1992, a court challenge led to the reversal of these discriminatory practices. The federal government officially apologized in 2017.

As the threat of another world war loomed ever larger, Canadians, far from the conflict, would face a difficult choice of whether to stand again with Britain or remain isolated and safe in North America.

​The history of the Canadian Army parallels that of Canada itself. What started as a small Confederation-era militia was built into a respected force of mostly citizen soldiers for the First and Second World Wars.

More than 2,800 trained civilian nurses enlisted with the Canadian army during the First World War, becoming the first women in the modern world to hold military commissions as officers. As members of the Canadian Army Medical Corps (CAMC), the nursing sisters treated and cared for wounded soldiers overseas and at home. At least 58 died from disease or enemy action during the war.

The Canadian Aviation Corps was formed in September 1914, immediately after the start of the First World War. The three-person, one-plane unit sailed to Britain with the First Canadian Contingent in early October 1914 but never saw active service. The CAC was disbanded in May 1915. Canada would not have a permanent air force until 1924 (see Royal Canadian Air Force).

The Canadian Expeditionary Force was the army raised by Canada for service overseas in the First World War. About 630,000 Canadians enlisted between 1914 and 1918—most of them volunteers—as soldiers, nurses, doctors, and forestry and railway crews. More than 234,000 were killed or wounded in the war.